20 citations
,
June 2012 in “British Journal of Dermatology” Bleaching hair damages protein structure, especially keratin, leading to weakened hair.
1 citations
,
October 2023 in “Skin Research and Technology” Hair sunscreens were less effective than expected, especially for dark hair.
210 citations
,
May 2006 in “The FASEB journal” Oxidative stress causes hair to gray by damaging and killing pigment cells.
December 1978 in “Indian Journal of Otolaryngology and Head & Neck Surgery”
16 citations
,
February 2015 in “Photochemistry and Photobiology” Hair acts as a significant natural sun barrier, with protection increasing based on hair density, thickness, and melanin presence.
November 2015 in “Springer eBooks” Laser hair removal can be effective for people with darker skin tones.
6 citations
,
December 2019 in “International Journal of Cosmetic Science” White hair has weaker tryptophan fluorescence than other unpigmented fibers, possibly due to UV exposure or unknown substances.
4 citations
,
February 2025 in “Clinical Cosmetic and Investigational Dermatology” Hair affects self-image and well-being, varying by gender, ethnicity, and country.
January 1957 in “Nihon Chikusan Gakkaiho” Rabbit hair color is influenced by the shape and distribution of pigment granules.
1 citations
,
November 2022 in “DOAJ (DOAJ: Directory of Open Access Journals)” Male and female human hairs have different microscopic structures that can help in forensic analysis.
152 citations
,
December 2003 in “Micron” As people age, their hair follicles produce less pigment, leading to gray and white hair, due to factors like reduced enzyme activity and damage to melanocyte DNA.
8 citations
,
May 2003 in “Clinical and Experimental Dermatology” A 14-year-old girl's black hair showed unique color changes, suggesting early greying.
24 citations
,
January 2001 in “International Journal of Cancer” Permanent hair dye use may increase bladder cancer risk, especially in female smokers with certain genetic traits.
10 citations
,
January 2013 in “International Journal of Trichology” More vellus hairs in frontal scalp indicate early female pattern hair loss.
82 citations
,
May 2005 in “Dermatologic therapy” Laser hair removal has advanced to effectively reduce hair for various skin types and hair colors.
October 2022 in “Southeast Asian journal of health professionals” Hair greying is seen as a sign of aging; temporary fixes like hair dye are used, but a balanced diet and hair care can help manage it.
April 2018 in “Journal of Investigative Dermatology” Fat under the skin can help hair grow longer, darker, and increase cell growth.
9 citations
,
July 1982 in “International Journal of Dermatology” A 31-year-old man's hair turned white suddenly, likely due to alopecia areata.
May 2023 in “Elsevier eBooks”
A 5-year-old girl has sparse, dry, and brittle hair but is otherwise healthy.
April 1986 in “CRC Press eBooks” Hair color is determined by melanins produced in hair cells.
46 citations
,
April 2014 in “PLOS ONE” Gray hair may be caused by lower antioxidant activity in hair cells.
November 2021 in “CRC Press eBooks” Hair color is determined by melanin and can be affected by genetic conditions like albinism.
1 citations
,
January 2007 in “AIP conference proceedings” High-resolution x-ray images showed three main structures in human hair: medulla, cortex, and cuticle.
4 citations
,
December 2020 in “Journal of the American Academy of Dermatology” Pulling 2 or fewer hairs is normal for all hair types, including Afro- and Asian-textured hair.
September 2017 in “Journal of Investigative Dermatology” Photodynamic therapy can potentially remove nonpigmented hair by damaging hair follicles.
East and Southeast Asians typically have less dense but thicker, straight black hair.
115 citations
,
August 2008 in “The Journal of Clinical Endocrinology & Metabolism” Thyroid hormones help hair grow, reduce hair loss, and increase hair pigment.
56 citations
,
November 2010 in “Pigment Cell & Melanoma Research” Brain hormones significantly affect hair color and could potentially be used to prevent or reverse grey hair.